Fastening device



FIG. 1 is a top plan view of the fastening device showing our new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a top front perspective view thereof; and,

FIG. 8 is a top front perspective view thereof showing the environment of use of the design.

The broken lines shown in the figures form no part of the claimed design. 

CLAIM The ornamental design for a fastening device, shown and described. 